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<title>GstGLFilter: GStreamer Bad Plugins 1.0 Library Reference Manual</title>
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<h2><span class="refentrytitle"><a name="GstGLFilter.top_of_page"></a>GstGLFilter</span></h2>
<p>GstGLFilter — GstBaseTransform subclass for dealing with RGBA textures</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="GstGLFilter.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GstGLFilter.html#gst-gl-filter-render-to-target" title="gst_gl_filter_render_to_target ()">gst_gl_filter_render_to_target</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstGLFilter.html#gst-gl-filter-render-to-target-with-shader" title="gst_gl_filter_render_to_target_with_shader ()">gst_gl_filter_render_to_target_with_shader</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GstGLFilter.html#gst-gl-filter-filter-texture" title="gst_gl_filter_filter_texture ()">gst_gl_filter_filter_texture</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstGLFilter.html#gst-gl-filter-draw-fullscreen-quad" title="gst_gl_filter_draw_fullscreen_quad ()">gst_gl_filter_draw_fullscreen_quad</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GstGLFilter.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="GstGLFilter.html#GstGLFilter-struct" title="GstGLFilter">GstGLFilter</a></td>
</tr>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="GstGLFilter.html#GstGLFilterClass" title="GstGLFilterClass">GstGLFilterClass</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GstGLFilter.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    <a href="/usr/share/gtk-doc/html/gobjectgobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
    <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gobjectgobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
        <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0GstObject.html#GstObject-struct">GstObject</a>
            <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0GstElement.html#GstElement-struct">GstElement</a>
                <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-libs-1.0GstBaseTransform.html#GstBaseTransform-struct">GstBaseTransform</a>
                    <span class="lineart">╰──</span> <a class="link" href="GstGLBaseFilter.html" title="GstGLBaseFilter">GstGLBaseFilter</a>
                        <span class="lineart">╰──</span> GstGLFilter
</pre>
</div>
<div class="refsect1">
<a name="GstGLFilter.description"></a><h2>Description</h2>
<p><a class="link" href="GstGLFilter.html" title="GstGLFilter"><span class="type">GstGLFilter</span></a> helps to implement simple OpenGL filter elements taking a
single input and producing a single output with a <a class="link" href="GstGLFramebuffer.html" title="GstGLFramebuffer"><span class="type">GstGLFramebuffer</span></a></p>
</div>
<div class="refsect1">
<a name="GstGLFilter.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gst-gl-filter-render-to-target"></a><h3>gst_gl_filter_render_to_target ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_gl_filter_render_to_target (<em class="parameter"><code><a class="link" href="GstGLFilter.html" title="GstGLFilter"><span class="type">GstGLFilter</span></a> *filter</code></em>,
                                <em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstGLMemory.html#GstGLMemory" title="GstGLMemory"><span class="type">GstGLMemory</span></a> *input</code></em>,
                                <em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstGLMemory.html#GstGLMemory" title="GstGLMemory"><span class="type">GstGLMemory</span></a> *output</code></em>,
                                <em class="parameter"><code><span class="type">GstGLFilterRenderFunc</span> func</code></em>,
                                <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>);</pre>
<p>Transforms <em class="parameter"><code>input</code></em>
 into <em class="parameter"><code>output</code></em>
 using <em class="parameter"><code>func</code></em>
 on through FBO.</p>
<div class="refsect3">
<a name="gst-gl-filter-render-to-target.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>filter</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstGLFilter.html" title="GstGLFilter"><span class="type">GstGLFilter</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>input</p></td>
<td class="parameter_description"><p>the input texture</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>output</p></td>
<td class="parameter_description"><p>the output texture</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>func</p></td>
<td class="parameter_description"><p> the function to transform <em class="parameter"><code>input</code></em>
into <em class="parameter"><code>output</code></em>
. called with <em class="parameter"><code>data</code></em>
. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="The callback is valid only during the call to the method."><span class="acronym">scope call</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>data</p></td>
<td class="parameter_description"><p> the data associated with <em class="parameter"><code>func</code></em>
. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-gl-filter-render-to-target.returns"></a><h4>Returns</h4>
<p> the return value of <em class="parameter"><code>func</code></em>
</p>
</div>
<p class="since">Since: 1.10</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-gl-filter-render-to-target-with-shader"></a><h3>gst_gl_filter_render_to_target_with_shader ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_gl_filter_render_to_target_with_shader
                               (<em class="parameter"><code><a class="link" href="GstGLFilter.html" title="GstGLFilter"><span class="type">GstGLFilter</span></a> *filter</code></em>,
                                <em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstGLMemory.html#GstGLMemory" title="GstGLMemory"><span class="type">GstGLMemory</span></a> *input</code></em>,
                                <em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstGLMemory.html#GstGLMemory" title="GstGLMemory"><span class="type">GstGLMemory</span></a> *output</code></em>,
                                <em class="parameter"><code><a class="link" href="GstGLShader.html" title="GstGLShader"><span class="type">GstGLShader</span></a> *shader</code></em>);</pre>
<p>Transforms <em class="parameter"><code>input</code></em>
 into <em class="parameter"><code>output</code></em>
 using <em class="parameter"><code>shader</code></em>
 with a FBO.</p>
<p>See also: <a class="link" href="GstGLFilter.html#gst-gl-filter-render-to-target" title="gst_gl_filter_render_to_target ()"><code class="function">gst_gl_filter_render_to_target()</code></a></p>
<div class="refsect3">
<a name="gst-gl-filter-render-to-target-with-shader.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>filter</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstGLFilter.html" title="GstGLFilter"><span class="type">GstGLFilter</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>input</p></td>
<td class="parameter_description"><p>the input texture</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>output</p></td>
<td class="parameter_description"><p>the output texture</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>shader</p></td>
<td class="parameter_description"><p>the shader to use.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.4</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-gl-filter-filter-texture"></a><h3>gst_gl_filter_filter_texture ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_gl_filter_filter_texture (<em class="parameter"><code><a class="link" href="GstGLFilter.html" title="GstGLFilter"><span class="type">GstGLFilter</span></a> *filter</code></em>,
                              <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0GstBuffer.html#GstBuffer-struct"><span class="type">GstBuffer</span></a> *inbuf</code></em>,
                              <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0GstBuffer.html#GstBuffer-struct"><span class="type">GstBuffer</span></a> *outbuf</code></em>);</pre>
<p>Perform automatic upload if needed, call filter_texture vfunc and then an
automatic download if needed.</p>
<div class="refsect3">
<a name="gst-gl-filter-filter-texture.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>filter</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstGLFilter.html" title="GstGLFilter"><span class="type">GstGLFilter</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>inbuf</p></td>
<td class="parameter_description"><p>an input buffer</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>outbuf</p></td>
<td class="parameter_description"><p>an output buffer</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-gl-filter-filter-texture.returns"></a><h4>Returns</h4>
<p> whether the transformation succeeded</p>
</div>
<p class="since">Since: 1.4</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-gl-filter-draw-fullscreen-quad"></a><h3>gst_gl_filter_draw_fullscreen_quad ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_gl_filter_draw_fullscreen_quad (<em class="parameter"><code><a class="link" href="GstGLFilter.html" title="GstGLFilter"><span class="type">GstGLFilter</span></a> *filter</code></em>);</pre>
<p>Render a fullscreen quad using the current GL state.  The only GL state this 
modifies is the necessary vertex/index buffers and, if necessary, a
Vertex Array Object for drawing a fullscreen quad.  Framebuffer state,
any shaders, viewport state, etc must be setup by the caller.</p>
<div class="refsect3">
<a name="gst-gl-filter-draw-fullscreen-quad.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>filter</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstGLFilter.html" title="GstGLFilter"><span class="type">GstGLFilter</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.10</p>
</div>
</div>
<div class="refsect1">
<a name="GstGLFilter.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstGLFilter-struct"></a><h3>GstGLFilter</h3>
<pre class="programlisting">typedef struct _GstGLFilter GstGLFilter;</pre>
<div class="refsect3">
<a name="GstGLFilter.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GstGLFilterClass"></a><h3>GstGLFilterClass</h3>
<pre class="programlisting">typedef struct {
  GstGLBaseFilterClass parent_class;

  gboolean (*set_caps)          (GstGLFilter* filter, GstCaps* incaps, GstCaps* outcaps);
  gboolean (*filter)            (GstGLFilter *filter, GstBuffer *inbuf, GstBuffer *outbuf);
  gboolean (*filter_texture)    (GstGLFilter *filter, GstGLMemory *in_tex, GstGLMemory *out_tex);
  gboolean (*init_fbo)          (GstGLFilter *filter);

  GstCaps *(*transform_internal_caps) (GstGLFilter *filter,
    GstPadDirection direction, GstCaps * caps, GstCaps * filter_caps);

  /* useful to init and cleanup custom gl resources */
  void (*display_init_cb)       (GstGLFilter *filter);
  void (*display_reset_cb)      (GstGLFilter *filter);
} GstGLFilterClass;
</pre>
<div class="refsect3">
<a name="GstGLFilterClass.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstGLFilterClass.set-caps"></a>set_caps</code></em> ()</p></td>
<td class="struct_member_description"><p>mirror from <a href="/usr/share/gtk-doc/html/gstreamer-libs-1.0GstBaseTransform.html#GstBaseTransform-struct"><span class="type">GstBaseTransform</span></a></p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstGLFilterClass.filter"></a>filter</code></em> ()</p></td>
<td class="struct_member_description"><p>perform operations on the input and output buffers.  In general,
you should avoid using this method if at all possible. One valid
use-case for using this is keeping previous buffers for future calculations.
Note: If <em class="parameter"><code>filter</code></em>
exists, then <em class="parameter"><code>filter_texture</code></em>
is not run</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstGLFilterClass.filter-texture"></a>filter_texture</code></em> ()</p></td>
<td class="struct_member_description"><p>given <em class="parameter"><code>in_tex</code></em>
, transform it into <em class="parameter"><code>out_tex</code></em>
.  Not used
if <em class="parameter"><code>filter</code></em>
exists</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstGLFilterClass.init-fbo"></a>init_fbo</code></em> ()</p></td>
<td class="struct_member_description"><p>perform initialization when the Framebuffer object is created</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstGLFilterClass.transform-internal-caps"></a>transform_internal_caps</code></em> ()</p></td>
<td class="struct_member_description"><p>Perform sub-class specific modifications of the
caps to be processed between upload on input and before download for output.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstGLFilterClass.display-init-cb"></a>display_init_cb</code></em> ()</p></td>
<td class="struct_member_description"><p>execute arbitrary gl code on start</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstGLFilterClass.display-reset-cb"></a>display_reset_cb</code></em> ()</p></td>
<td class="struct_member_description"><p>execute arbitrary gl code at stop</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="GstGLFilter.see-also"></a><h2>See Also</h2>
<p><a href="/usr/share/gtk-doc/html/gstreamer-libs-1.0GstBaseTransform.html#GstBaseTransform-struct"><span class="type">GstBaseTransform</span></a>, <a class="link" href="GstGLContext.html" title="GstGLContext"><span class="type">GstGLContext</span></a>, <a class="link" href="GstGLFramebuffer.html" title="GstGLFramebuffer"><span class="type">GstGLFramebuffer</span></a></p>
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